I have DriveHQ installed on 3 different machines (home, office and notebook), and I have the home and office machines set to synchronize my data directory (same on all computers) using a daily synchronization. Trouble is that each time the auto synch runs, it pops up a window

Please make sure you have the latest version DriveHQ FileManager 4.5 build 327 (or future versions). You can click on Tools --> Manage Synchronization to configure the default action; a screenshot is shown below.